(单选题)
I think it’s_____ unusual thing to see ____ UFO.
A.an; an
B.an; a
C.a; the
D.the; an
参考答案：B
参考解析：
考查不定冠词a与不定冠词an。句意为“我认为看到一个不明飞行物是一件不寻常的事”，两空均为泛指，unusual是以元音[ʌ]开头，UFO以辅音[ju:]开头。故选B。
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